Tag: dhcp

Scapy DHCP listener in Python

Scapy DHCP listener in Python

This script listens for DHCP Request and Discover packets on the LAN using scapy.

A little background on the DHCP protocol

Hosts issue a DHCP Discover packet to destination to request an IP Address assignment from a DHCP server. DHCP Discover, Request, Offer, Ack and Inform packets are sent as broadcasts, all hosts on the LAN receive these packets. Because of the nature of the protocol, no special port mirroring or tapping is required on the host that runs this script.

This script is the foundation for creating a passive network discovery tool. We can collect and store the Mac Address, Hostname, and IP Address all hosts configured for DHCP IP address assignment.

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